1089641 has 4 divisors (see below), whose sum is σ = 1245312. Its totient is φ = 933972.

The previous prime is 1089629. The next prime is 1089653. The reversal of 1089641 is 1469801.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (1089629) and next prime (1089653).

It is a cyclic number.

It is not a de Polignac number, because 1089641 - 2¹⁰ = 1088617 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1089611) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 77825 + ... + 77838.

It is an arithmetic number, because the mean of its divisors is an integer number (311328).

2^1089641 is an apocalyptic number.

It is an amenable number.

1089641 is a deficient number, since it is larger than the sum of its proper divisors (155671).

1089641 is an equidigital number, since it uses as much as digits as its factorization.

1089641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 155670.

The product of its (nonzero) digits is 1728, while the sum is 29.

The square root of 1089641 is about 1043.8587069139. The cubic root of 1089641 is about 102.9029468799.

The spelling of 1089641 in words is "one million, eighty-nine thousand, six hundred forty-one".